Event ID - 43

Event Id43
SourceDISK
DescriptionCrash dump is disabled! NT failed to initialize the boot partition paging file for crashdump. This may be because the system has more than 3.8GB of physical memory.
Event InformationIn Windows 2000 or Windows Server 2003, when you load a Microsoft Windows NT 4.0 system event log that contains an Event ID 43, you see the wrong information displayed in Event Viewer.
CAUSE:
This event is recorded when the page file on the system partition is set to a size smaller than the physical RAM in the computer. 
RESOLUTION:
To keep the error message from appearing in the event log, ensure that the page file on the system partition is larger than the amount of physical RAM on the machine.

To change the size of the page file, follow these steps: 
1) In Control Panel, double-click System.
2) On the Performance tab, click Change, and then change the minimum size of the page file on the system partition to a value at least the size of physical RAM plus 1 MB.
3) Restart the computer.
MORE INFORMATION:
In Windows NT 4.0, an Event ID 43 describes a possible issue with the size of the paging file. In Windows 2000 or Windows Server 2003, an Event ID 43 is a problem that deals with power management, and the log displays the driver that is not allowing the system to suspend. If you view the Windows NT 4.0 log in Windows 2000 or Windows Server 2003, the Event ID 43 contains the following description 
The system sleep operation failed with a source of DISK.
Reference Links Event ID 43 Is Displayed Incorrectly in Event Viewer in Windows 2000 and Windows Server 2003

ERROR: Event ID 43: Crash Dump Is Disabled

SP4 on Windows NT 4.0 Enterprise Causes Event ID 43: Crash Dump is Disabled

Windows NT 4.0 Server Crash Dump Error And Event ID 43.

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